| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Atech Transformers Ltd | 00475827 | 11/11/1993 | Dissolved |
| IPR PROPERTY LIMITED | 06407539 | 14/11/2008 | One Red Flag |
| Ipr Technical Developments Ltd | 03280356 | 19/11/1996 | Dissolved |
| Line Yield Technologies Ltd | 03913548 | 04/07/2001 | Dissolved |
| OZONE HOLDINGS PLC | 05513685 | 03/08/2006 | Dissolved |
| POWERSTAX LTD | 02688692 | 18/02/1993 | Bronze |
| Voipmoco Ltd | 06404946 | 22/10/2007 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ADVANCED POWER CONVERSION LIMITED | 01400986 | 08/08/1991 | 04/07/2001 | Dissolved |
| Atech Transformers Ltd | 00475827 | 11/11/1993 | 30/11/1993 | Dissolved |
| BURNSIDE TELECOM LIMITED | 04241158 | 04/05/2006 | 25/03/2013 | Dissolved |
| Home Cellular Ltd | 02928275 | 12/05/1994 | 12/05/2004 | Dissolved |
| NOKIA MOBILE PHONES (U.K.) LIMITED | 01787336 | 22/12/1991 | 19/05/1992 | Dissolved |
| OZONE INDUSTRIES LIMITED | 02973246 | 24/03/2006 | 30/11/2015 | Bronze |
| ROVI SOLUTIONS LIMITED | 02683202 | 05/08/1993 | 18/06/1999 | Dissolved |
| Tellit Communications Ltd | 03380895 | 30/06/1997 | 05/03/1999 | Dissolved |
| VTECH COMMUNICATIONS LIMITED | 02681003 | 15/02/1993 | 14/12/1994 | Silver |
| Vtech Holdings Ltd | FC016317 | 23/01/1992 | 28/11/2001 | Dissolved |